<template>
  <div class="upload-file">
    <el-upload
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      ref="upload"
      :disabled="isReadonly"
    >
      <!-- 上传按钮 -->
      <el-button size="mini" type="primary">上传文件</el-button>
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        支持拓展名：
        <template v-if="fileType">
          <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        格式
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group
      v-if="isShowFileList"
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >
      <li
        v-for="(file, index) in fileList"
        :key="file.uid"
        class="el-upload-list__item ele-upload-list__item-content"
      >
        <el-link
          :href="`${file[config.config ? config.config.filePath : 'filePath']}`"
          :underline="false"
          target="_blank"
        >
          <span class="el-icon-document">
            {{ file[config.config ? config.config.fileName : "fileName"] }}
          </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link :underline="false" @click="handleDelete(index)" type="danger"
            >删除</el-link
          >
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import Inject from "../../../mixin/inject";
export default {
  mixins: [Inject],
  name: "FileUpload",
  props: {
    isShowFileList: {
      type: Boolean,
      default: true,
    },
    formData: Object,
    isReadonly: {
      type: Boolean,
      default: false,
    },
    config: {
      type: Object,
      default: () => Object.create(null),
    },
    // 值
    value: [String, Object, Array],
    // 数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },

    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
  },
  data() {
    return {
      // fileType: ["doc", "xls", "ppt", "txt", "pdf"],
      fileType: ["pdf", "doc", "docx"],
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/file/ossUpload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
    };
  },

  watch: {
    curVal: {
      handler(val) {
        if (val) {
          let temp = 1;
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.curVal.split(",");
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === "string") {
              item = { name: item, url: item };
            }
            item.uid = item.uid || new Date().getTime() + temp++;
            return item;
          });
          console.log(this.fileList);
        } else {
          this.$set(this, "fileList", []);
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    curVal() {
      return this.formData[this.config.prop] || "";
    },
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  created() {
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    if (this.config.fileType) {
      this.fileType = this.config.fileType;
    }
  },
  methods: {
    update(val) {
      this.formData[this.config.prop] = val;
      this.$emit("update:formData", this.formData);
      this.$emit("change");
    },
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        const isTypeOk = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
        if (!isTypeOk) {
          this.$message.error(`上传${this.fileType.join("/")}格式文件!`);
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      return true;
    },
    // 文件个数超出
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError(err) {
      this.$message.error("上传失败, 请重试");
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      this.$message.success("上传成功");
      this.fileList.push({
        fileName: file.name,
        filePath: res.url,
        attachName: file.name,
        attachUrl: res.url,
      });
      //this.$emit("input", this.listToString(this.fileList));
      this.update(this.fileList);
      if (
        this.config.change &&
        this.$CD[this.config.change] instanceof Function
      ) {
        this.$CD[this.config.change](this.fileList);
      }
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
      //this.$emit("input", this.listToString(this.fileList));
      this.update(this.fileList);
      if (
        this.config.change &&
        this.$CD[this.config.change] instanceof Function
      ) {
        this.$CD[this.config.change](this.fileList);
      }
    },
    // 获取文件名称
    getFileName(name) {
      console.log(name);
      if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1).toLowerCase();
      } else {
        return "";
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
